add csharp version to the exercice

csharp/TheatricalPlayersRefactoringKata/StatementPrinter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+
+namespace TheatricalPlayersRefactoringKata
+{
+    public class StatementPrinter
+    {
+        public string Print(Invoice invoice, Dictionary<string, Play> plays)
+        {
+            var totalAmount = 0;
+            var volumeCredits = 0;
+            var result = string.Format("Statement for {0}\n", invoice.Customer);
+            CultureInfo cultureInfo = new CultureInfo("en-US");
+
+            foreach(var perf in invoice.Performances) 
+            {
+                var play = plays[perf.PlayID];
+                var thisAmount = 0;
+                switch (play.Type) 
+                {
+                    case "tragedy":
+                        thisAmount = 40000;
+                        if (perf.Audience > 30) {
+                            thisAmount += 1000 * (perf.Audience - 30);
+                        }
+                        break;
+                    case "comedy":
+                        thisAmount = 30000;
+                        if (perf.Audience > 20) {
+                            thisAmount += 10000 + 500 * (perf.Audience - 20);
+                        }
+                        thisAmount += 300 * perf.Audience;
+                        break;
+                    default:
+                        throw new Exception("unknown type: " + play.Type);
+                }
+                // add volume credits
+                volumeCredits += Math.Max(perf.Audience - 30, 0);
+                // add extra credit for every ten comedy attendees
+                if ("comedy" == play.Type) volumeCredits += (int)Math.Floor((decimal)perf.Audience / 5);
+
+                // print line for this order
+                result += String.Format(cultureInfo, "  {0}: {1:C} ({2} seats)\n", play.Name, Convert.ToDecimal(thisAmount / 100), perf.Audience);
+                totalAmount += thisAmount;
+            }
+            result += String.Format(cultureInfo, "Amount owed is {0:C}\n", Convert.ToDecimal(totalAmount / 100));
+            result += String.Format("You earned {0} credits\n", volumeCredits);
+            return result;
+        }
+    }
+}